采取在Android 2.2的朝前的照片和后置摄像头 [英] Take photos from front-facing and rear cameras on android 2.2

问题描述

我设计一个应用程序（在2.2版）使用相机拍摄的照片。

I'm designing an app (on version 2.2) that use the camera to capture photos.

我从 http://developer.android.com/sdk/android-2.3阅读html的该版本2.3及以上的有多个摄像头的支持。但我还是有点困惑，因为当相机启动时，它通常有一个按钮，用户可以单击前置和后置摄像头之间切换，对不对？

I read from http://developer.android.com/sdk/android-2.3.html that version 2.3 and above have multiple cameras support. But i'm still a bit confused because when the camera is launched, it normally have a button that the user can click to switch between front-facing and rear cameras, right?

或

2.2没有这个开关？

2.2 doesn't have this switch?

我希望用户能够同时使用前部和后部摄像机。是否有可能在2.2版本或者我应该使用2.3及以上？

I want the user to be able to use both front and rear cameras. Is it possible on version 2.2 or should I use 2.3 and above?

推荐答案

是的，2.2只能管理后置摄像头。
对于正面摄像头，你需要升级到2.3 +

Yes, 2.2 can only manage rear camera. For frontal camera you need to upgrade to 2.3+.

private int getBestCameraId() {

        PackageManager pm = m_mainThreadContext.getPackageManager();

        try {
            if (pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT)) {
                Log.i(TAG, "Phone has a frontal camera.");
                return Camera.CameraInfo.CAMERA_FACING_FRONT;
            } else {
                Log.i(TAG, "Phone has only rear camera.");
                return Camera.CameraInfo.CAMERA_FACING_BACK;
                }
        } catch (Exception e) {
                return Camera.CameraInfo.CAMERA_FACING_BACK;
    }

}

有了这个简单的功能，它检查手机是否有正面或后置摄像头，并返回最佳。
返回可以在Camera.open（ID）一起使用的ID来选择所需要的摄像机

With this simple function it check whether the phone has a frontal or rear camera, and return the best. The id returned can be used in the Camera.open(id) to select the desired camera.

如果你的清单，你写的：

If in your Manifest you write:

<uses-sdk android:minSdkVersion="8" />

和你发展与库2.3（或+）项目，我已经张贴像一个魅力的作品的功能！
我在相机项目中使用，所以请相信我;）

and you develop your project with libraries 2.3 (or +), the function i have posted works like a charm! I've used in a camera project, so trust me ;)

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